Keychain is documented here and is encrypted using AES-256-GCM: https://support.apple.com/en-au/guide/security/secb0694df1a/web https://support.apple.com/en-au

Keychain is documented here and is encrypted using AES-256-GCM: https://support.apple.com/en-au/guide/security/secb0694df1a/web https://support.apple.com/en-au/guide/security/secb0694df1a/... It’s then stored in iCloud as a SQLite file and encrypted as it does for your other synced data.